Treatment and analysis

Like many archaeological iron objects, the metal of the padlock had been converted into hard, bulky corrosion products. X-radiography, part of the process of investigative conservation, revealed the identity of the object.

The X-ray also revealed some decoration on the surface and suggested how this had been applied.


The padlock prior to conservation

 

X-ray showing surface decoration
Airbrasive equipment in use The next stage in the investigation for the conservators was carefully to remove corrosion crusts using specialised air abrasive equipment. This gently removes surface layers using compressed air and abrasive powders.

The conservator has to look down a microscope whilst working to ensure that no vital clues about the construction and use of the object are missed. The whole process took several months. It was discovered that the lock had been broken into before burial. The object was then sent away for XRF analysis in order to identify the metal used to attach the decoration.

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